30results about How to "Realize one-way circulation" patented technology

The invention provides a blood return prevention infusion connector which comprises an outer connector, an inner connecting seat and an elastic barrier piece. The outer connector is hermetically connected with the inner connecting seat, the elastic barrier piece is arranged between a liquid inlet of outer connector and a liquid outlet of the inner connecting seat, the periphery of the elastic barrier piece is connected with the inner wall of the liquid inlet, the elastic barrier piece is provided with a closed portion and a liquid though port, and the closed portion covers a liquid outlet of the inner connecting seat. By the aid of the blood return prevention infusion connector, the elastic barrier piece is fixed for the first time, one-way flow of liquid medicine is realized by only depending on deformation of the elastic barrier piece, the blood return can be prevented by the infusion connector even if liquid pressure is equal to human venous pressure or the pressure difference between the liquid pressure and the human venous pressure are smaller, the connector effectively solves the problem that a blood return prevention infusion connector cannot really function in preventing blood return in prior art, so that blood return is avoided even if an infusion person optionally walks or lifts an arm in the infusion process, and clinical application is more facilitated.

The invention discloses a one-way valve and an infusion device, wherein the one-way valve comprises: a first shell, provided with a liquid passage; a second shell connected to the first shell, whereinthe surface of the second shell opposite to the first shell is provided with a liquid chamber in recessed manner, the surface of the second shell facing the first shell is provided with a first mounting groove communicated with the liquid passage, and the second shell is provided with a liquid hole, in the periphery of the bottom wall of the liquid chamber, communicated with the bottom wall of the first mounting groove; and a seal which is arranged between the first shell and the second shell, wherein at least part of the seal is embedded in the first mounting groove so as to open or close the liquid hole such that the liquid passage is communicated or disconnected with the liquid chamber. The one-way valve prevents bubbles from generating during liquid delivery, so that liquid quality isimproved.

The invention discloses a silicon carbide single crystal growth device capable of balancing the atmosphere of a growth system, which includes a graphite crucible for holding silicon carbide powder and heating the silicon carbide to make the The silicon carbide powder is sublimated and decomposed into gas phase components; the seed crystal holder is used to hold the seed crystal capable of growing silicon carbide single crystal; the air pipe, including the outer air pipe and the inner air pipe, is used to capture and absorb the sublimated gas phase components, from The bottom of the trachea is slowly released into the silicon carbide powder; the halogen gas trachea is used to consume more silicon components in the initial stage of crystal growth, and the two work together to realize the gas phase silicon and carbon components in the sublimation process during the growth of silicon carbide single crystals. Medium dynamic balance, keep the ratio of carbon and silicon in the crystal growth area in the optimal range, and improve the quality of silicon carbide single crystal growth.

The invention discloses a one-way vent valve comprising a valve body. An intake passages and an exhaust passage which are independent are arranged in the valve body. Two elastic spools having opposite directions and same structure are disposed in the intake passage and the exhaust passage respectively. One end of each spool is in a hollow structure having an air inlet, and the outer walls of the other ends of the spools are provided with two opposing wedged faces. An exhaust slit is reserved at an intersection of the two edged faces. The sidewalls of the spools are hermetically fixed to the inner walls of the intake and exhaust passages. The invention further discloses a breathable shoe with the one-way vent valve. The one-way vent valve is simple in structure and unique in design; through the exhaust slit in special structure and the independent intake and exhaust passages, unidirectional air flowing is achieved, inside and outside air mixing is prevented, and continuous supply of fresh air is guaranteed.

The invention discloses a viscous damper and a bridge with viscous dampers, and relates to the field of bridge design. The viscous damper comprises a body, a piston rod and a piston. A cavity is formed in the body and filled with a damping medium, one end of the piston rod stretches into the cavity, the piston is arranged at the end, stretching into the cavity, of the piston rod and divides the cavity into a first chamber and a second chamber, and at least one channel is formed between the first chamber and the second chamber; at least one one-way channel is further formed between the first chamber and the second chamber, and the one-way channels are opened when the viscous damper bears tension and are closed when the viscous damper bears pressure. According to the viscous damper, one-way circulation of the first chamber and the second chamber can be achieved, one-way acting force is generated on an object, and then bridge abutments only bear thrust of a girder and do not bear tension, so that the stress state of the bridge abutments is greatly improved, damage to the bridge abutments is not likely to be caused, the stability of the bridge structure is improved, and the maintenance cost is reduced.

The present application relates to an anti-return air intake structure for a rotary detonation combustion chamber, which includes a Tesla valve communicated with the rotary detonation combustion chamber and disposed at the inlet of the rotary detonation combustion chamber, the Tesla valve comprising a housing and a flow channel, the casing is coaxially connected to the outer wall of the rotary detonation combustion chamber, the flow channel is arranged in the casing, the inlet end of the flow channel is used for introducing air, and the outlet end of the flow channel is connected to the The annular channel of the rotary detonation combustion chamber communicates with each other. The present application utilizes the one-way flow characteristic of the Tesla valve to separate the forward passage of air and fuel into the rotary detonation combustion chamber and the reverse passage of pressure return, effectively reducing the pressure return to the forward entry. The obstacle of the air and fuel, so that the knocking boost can make up for the total pressure loss caused by the upper intake air, thereby improving the total pressure gain of the rotary knocking combustion chamber.

The invention discloses a self-heating type vibrating rod for concrete drumming, which belongs to the field of concrete vibration technology. By circularly distributing a plurality of groups of vibrating balls on the outer wall of a hollow rod body, the lifting rod moves up and down, and the bar-shaped teeth With synchronous lifting movement, the vibrating ball installed with multiple heat conduction rods is driven by the arc-shaped toothed belt to turn up and down on the outside of the hollow rod body, which effectively vibrates the concrete. The gas ring-shaped exhaust part effectively discharges the gas in the concrete into the hollow rod during the vibration of the concrete. On the one hand, it effectively reduces the gas in the concrete and reduces the amount of air bubbles in the concrete. On the other hand, the air introduced and the vibration The self-heating layer filled inside the ball reacts to provide a reaction medium for the self-heating layer, so that the self-heating layer generates heat to provide heat for the vibrating ball, and evenly distributes the heat to the concrete, effectively realizing a more comprehensive heating and heat preservation treatment for the concrete.

The invention discloses a swing check valve, and belongs to the technical field of design of water valves. The swing check valve comprises a valve body, a valve clack, a connecting rod, a bolt, a nut, a cotter pin, a cylindrical pin, a cover plate, stand columns and a fixing pin. The connecting rod is connected into a pipeline of the valve body. The valve clack and the connecting rod are connected through the bolt. The right end of the bolt is screwed into the nut. The cotter pin is arranged on the portion, located at the right end of the nut, of the bolt so that the situation that the nut falls from the right end of the bolt after getting loose can be effectively prevented. The connecting rod and the valve clack are connected reliably, the top of the valve body is covered with the cover plate, and the valve body and the cover plate are fixedly connected through the bolt. According to the swing check valve disclosed by the invention, unidirectional circulation of water flow can be achieved conveniently, the connecting rod and the valve clack can flexibly rotate relative to the valve body, the connecting rod and the valve body are connected reliably, and the structure is simple; and the two stand columns are arranged on the portion, located on the right side of the fixing pin, of the bottom surface of the cover plate, so that the situation that the valve clack and the connecting rod collide with the valve body under the impact of the water flow is prevented, and the service life is prolonged.